Southshore Fine Linens 4-Piece 21 Inch Deep Pocket Sheet Set with Beautiful Lace (Cal King, Black) Microfiber Extra Deep Pocket Sheets - Easily Fits 21" mattresses - even the twin size Double Brushed on One side and single brushed on the other for extra Softness. These will be the softest sheets you will find on the market 110 GSM double brushed Microfiber sheet set Enhanced with Beautiful Lace - instantly add grace to your bed room. Not only the fitted sheet will fit the deep mattresses, it is also oversized in legnth and width to accommodate any topping mattresses you might have.